Engineers were called in after wind dislodged panels surrounding the 60m structure in the Leazes Stand, and turnstiles remained closed at St James' Park and the match kicked off at 16:00 BST, an hour later than scheduled.
The club said: "Supporter safety was of paramount importance."
The screen was erected during the international break and no fans were in the ground when the problem was spotted, the club said
It added: "We wish to apologise to everyone who suffered inconvenience as a result of this issue today and wish to place on record our particular thanks to all supporters at St James' Park for their patience."
The fans won't be that bothered though given that Gabriel Obertan struck a precious goal to give Newcastle a 1-0 win over Leicester and ease some of the pressure on manager Alan Pardew. It was the Toon's first league win of the season and avoided an unwanted record eight winless games since the start of the season.